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Fix FastISel to recognize that the last block in the function does 

not have a fall-through successor.

llvm-svn: 55033
This commit is contained in:
Dan Gohman 2008-08-20 01:17:01 +00:00
parent 5dd15a3c45
commit e8f9a00424
1 changed files with 8 additions and 5 deletions
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11
llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
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@ -104,12 +104,15 @@ FastISel::SelectInstructions(BasicBlock::iterator Begin, BasicBlock::iterator En
// For now, check for and handle just the most trivial case: an
// unconditional fall-through branch.
if (BI->isUnconditional() &&
next(MachineFunction::iterator(MBB))->getBasicBlock() ==
BI->getSuccessor(0)) {
MBB->addSuccessor(next(MachineFunction::iterator(MBB)));
if (BI->isUnconditional()) {
MachineFunction::iterator NextMBB =
next(MachineFunction::iterator(MBB));
if (NextMBB != MF->end() &&
NextMBB->getBasicBlock() == BI->getSuccessor(0)) {
MBB->addSuccessor(NextMBB);
break;
}
}
// Something more complicated. Halt "fast" selection and bail.
return I;